[BNX2]: Improve SerDes handling.

1. Add support for 2.5Gbps forced speed setting.
2. Remove a long udelay() loop and change to msleep().
3. Other misc. SerDes fixes.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2.h

@@ -3696,6 +3696,8 @@ struct l2_fhdr {
 
 /* 5708 Serdes PHY registers */
 
+#define BCM5708S_BMCR_FORCE_2500		0x20
+
 #define BCM5708S_UP1				0xb
 
 #define BCM5708S_UP1_2G5			0x1